Any country willing to not be lent to again in future can default on their debts, nothing special there; the actual clever bit is stringing out the ability to accumulate debt at relatively low cost into decades of investment... something they seem to be willing to sacrifice to well and truly own the libs. The sadder reality is that there isn't any megasupersmart strategy, just an ageing buffoon with the foreign policy savvy of a middle schooler who's just heard about the Louisiana purchase and tariffs, and a bunch of grifters hanging on.
The experiment in "is America too big to fail" is probably going to result in a "not quite" answer, but they're really giving it a go.
Yeah.
Spain in the 1500s, the Netherlands in the 1600s and the British empire in the 1800s are good examples of countries considered too big to fail that they eventually crashed and burned and lost their world leader statuses rather fast.
In all three cases over reliance on new debt to fund stuff, disappearance of the middle class, and abusing their dominance (military and/or economic) made them crumble as other countries steered away from dealing with them.